"They definitely came together and sat together," an onlooker told E! Online. "Cameron would lean over and chat with Matthew, but it didn't seem too flirty."

Does this mean that they weren't together? Perhaps. A bystander told the London Daily Mail that they didn't think anything was going on. "I definitely didn't get a flirty vibe between Matthew and Cameron at all. They were just like a couple of friends hanging out for the evening."

Cameron and Matt were out with Diaz's actress-pal Joanna Garcia, who is engaged to ARod's Yankee teammate, Nick Swisher. So, was Matt just hanging with some friends, or finding himself a new duet partner? Developing...